Rotary brush



May 1 l, 1937.

-R. G. MERTES ROTARY BRUSH Filed July 13, 1934 IN VEN TOR Mag 9 Bu. BATTORNEYS- Patented May 11, 1937 UNITED STATES PATENT OFFICE ROTARYBRUSH of Pennsylvania Application July 13, 1934, Serial No. 734,981

4 Claims.

My invention relates to brushes for cleaning metallic, wood and rubbersurfaces and other service of similar character. The principal ob jectof my invention is to provide a brush embodying tufts of bristles somounted as to be retained in operative position during the life of thebrush. Moreover, its construction is of such character that the elementsthereof may be expeditiously assembled whereby the cost of the productis moderate considering the quality and utility of the brush.

A better understanding of my invention may be had by reference to theaccompanying drawing in which like numerals indicate correspondingparts:

Figure 1 is a side elevational view of a brush assembled in accordancewith my invention; Figure 2 is an edge view of the brush with certain ofthe tufts of bristles removed in order to illustrate more clearly thecharacter of the construction; Figure 3 is a side view of a ring havingpins of crank shape disposed therein which constitute a portion of theassembly; Figure 4 shows a plurality of rings disposed in spacedrelation with a plurality of pins assembled therewith which constitutethe elements of the core of the brush; Figure 5 is a sectional viewtaken substantially along a line V--V of Figure 3 showing the core ofthe brush; Figure 6 is a detail view of one of the pins of crank shapethat is em ployed to mount the tufts of bristles; and Figure '1 is adetail view of one of the supporting rings or plates.

In practicing my invention a brush I is formed by employing a pluralityof rings or plates 2 and 3 that are provided with annular grooves 4 andopenings 5 spaced at regular intervals in the grooves. A plurality ofpins 6 of crank shape are utilized each having a lever portion 1 andshaft .4!) portions 8 and 9. These pins are disposed, as indicated inFig. 4, with one shaft 9 through an opening in the annular groove of theplate 3 and its opposite shaft 8 through an opening in the plate 2,whereby the lever portion 1 is received within the annular grooves ofthe two plates when they are placed in engagement. The pins are thusdistributed at regular intervals between the two plates 2 and 3, whichare then secured together by welding or any other suitable means.

This forms a core for the brush, as illustrated in Figure 5, wherein theshafts of each pin 6 project from opposite sides of the.core instaggered relation. Tufts of bristles II, which are formed of wire orany other suitable material, are disposed upon the extending portions ofthe 5 pins and in consequence are retained in suitable spaced relation.

The tufts may be formed by utilizing a bundle of wire of suitable sizewhich is bent upon itself and twisted to form an eyelet at one end that10 may be slipped over one of the shafts of the crank pins,alternatively the bristle tuft may be formed by twisting it upon theshaft of the pin. After the bristles have been placed upon the pins,additional plates I2, having suitable openings to 15 receive the ends ofthe pins, are placed on opposite sides of the assembly thus presented.The ends of the pins are then beaded or turned over to form rivetfastenings thereby to complete an integral unit.

It will be observed that the assembly thus described is very compact andthat the core supporting the bristles constitutes a rigid and durablesupporting member. It is impossible for the supporting pins to turnbecause of any torque 25 strains imposed as a result of service of thebrush. Although the construction is inexpensive, it assures uniformoperating characteristics throughout the life of the brush.

Although I have described a single embodi- 30 ment of my invention andset forth a preferred method of realizing the advantage thereof, it willbe obvious that minor modifications may be made therein withoutdeparting from the spirit and scope thereof and I desire, therefore,that 35 only such limitations shall be imposed as are indicated in theappended claims.

What I claim is:'

1. A brush comprising a core formed of a plurality of elements, pins ofcrank shape secured 40 between such elements and projecting to each sidethereof through openings provided in said elements, tufts of bristlesdisposed directly upon the pins and plates secured to the pins wherebythe bristle tufts are retained in operative posi- 4 tion.

2. A brush comprising a plurality of plates, pins of crank shape securedbetween the plates and projecting to each side thereof through openingsprovided in said plates, tufts of bristles 50 disposed directly upon thepins and additional plates secured to the pins upon opposite sides ofthe body thus formed.

3. A brush comprising a plurality of plates, 5 pins of crank shapesecured between the plates with their ends projecting at opposite sidesin staggered relation through openings provided in said plates, tufts'ofbristles disposed directly upon the pins and additional plates securedto 10 the pins upon opposite sides of the body thus formed.

4. A brush comprising a plurality of annularly grooved plates, pins ofcrank shape secured between the plates with the lever portion of saidpins lying in the annular grooves of said plates and with the ends ofsaid pins projecting at opposite sides in staggered relation throughopenings provided in said plates, tufts of bristles disposed directlyupon the pins, and additional plates secured to the pins upon oppositesides of the body thus formed.

ROBERT G. MERTES.

